Portable reboring machine for engine cylinders



F. T. FLINCHBAUGH PORTABLE REBORING MACHINE FOR ENGINE CYLINDERS OrigiglFiled Sept. so, 1921 4'sheets-sheep1 F. T. FLINCHBAUGH PORTABLE REBORINGMACHINE FOR ENGINE CYLINDERS ori inal Filed Sept. 30, i921 4Sheets-Sheet 2 swam 11:04:

May 19,1925.

F. T. FLINCHBAUGH PORTABLE REBORING MACHIN E4 FOR ENGINE d'YLINDERs oriinal Filed Sept. 30. 1921 4 Sheets-Sheet 4 Patented May 19, 1925.

UNITED STAT ES. PATENT OFFICE.

FREDERICK FLINCHBAUGH; OF YORK, IENN'SYLVANIA, ASSIGNOR TO WAYNE TOOLMANUFACTURING COMPANY; OF YVAYNESBQRD, BENNSYLYANIA, A CORPORATION OFPENNSYLVANIA.

PORTABLE REBORING MACHINE FOR ENGINE CYLINDERS.

Application filed September 30, 1921, Serial No. 504,286. Renewed June14, 1924.

T0 0Z6 whom it wm-y concern:

Be it known that I FRnonnIoK T. FLINCH- BAUGH, citizen of the UnitedStates, residing at York, in the county of York and State ofPennsylvania, have invented certain new and useful Improvements inPortable Reboring Machines for Engine Cylinders, of which the followingis a specification.

This invention relates to an improved portable cylinder reboring machineparticularly designed for the use in reboring the cylinders of internalcombustion engines, and has as one of its principal objects to provide asturdy, compact and easilyoperated machine of this character forreboring a cylinder with accuracy.

A further ob'ect of the invention is to provide a machine adapted for awide range of use as regards diiierence in the diameter of the bore tobe out.

A still further object of the invention 'is to provide a machineembodying a variable feed and wherein the mechanism provided forcontrolling'the feed will be conveniently accessible.

The invention has as astill further object to provide a machine whereinthe cutter employed may be easily and quickly backed out of a cylinderwithout revolving the cutter or revolving the boring bar employed.

And the invention has as a still further object to provide a machinewhich. after being centered with respect to a cylinden may be detachedfrom the base employed for inspecting the work without molesting thecentering of the base'so that the machine may be replaced upon thebaseand the cutting operation continued without the necessity foragaincentering the machine;

Other and incidental objects will appear hereinafter. 1 In the drawings:Figure 1 is a perspective view of my improved reboring machine.

Figure 2 is a transverse section on theline 22 of Figure 1, looking inthe direction of the arrows,

Figure 3 is a fragmentary vertical sectional view,

Figure 4' is a section on the line 4-1 of Figure 3, lookingin thedirection of the arrows,

F anna is a fr m n ry secti nal view 'with the bearing.

particularly illustrating the rack sleeve of I the boring bar,

Figure 6 is a transverse sectional-view on the line -66-'of Figure 3,

Figure 7 is a transverse section on the line 77 of Figure 4, looking inthe direction of the arrows, and j Figure 8 is a perspective viewshowing the crank employed.

In carrying the invention into efi'ect, Iv

employ a cylindrical base 10 which is provided in the sides thereof withsight openings 11 and formed on the base at its lower end is a pluralityof lugs 12 with which may be engaged suitable clamps connecting the basewith an engine block centered with .respect to one of the cylinders ofthe-engine. In

Figure 1 of the drawings, I have conventlonally shown an'engine block at14. 'At its upper end the base is provided with oppositely disposed ears15 and. removably fitting upon the base is agear case 16. This gear caseis provided with ears 17 mating with the ears15 and coacting with saidears are cap bolts 18 detachably connecting the gear case with the base.Formed on the bottom wall of the gear case axially thereof is, asparticularly shown in Figure 4, a depending bearing 19 and closing thegear case at itsupper end is a cover plate 20 having an. upstandingbearing tube 21 alining Securing the cover in position are cap bolts 22threaded into the gear case. 3 w

' Snugly but'rot-atably fitting in the bearing tube 21 to extend throughthe bearing 19 'journaled thereby is a. boring bar 23 provided at its:upper endportion with a reduced stem 24 at the inner end of which isanal:- nular shoulder 25 and journaled upon the stem is a rack sleeve 26slidably fitting in said'tube. Interposed between the lower end of thesleeve and the shoulder 25 is a thrust washer 27 which is preferably offiber and formed on. the upper end of the stem 24 is a stud 28 overwhich is'fitted a washer'29 coacting with the upper end of the sleeve.

Threaded upon said'stud is a nut 80 coacting with the washer andsecuring. said nut against accidental displacement-is a jam nut 1. t e iet e l e is provided h a rack 32 extending-from end to end of the Sleevean the sleev in pe relation to said rack is, as particularly shown inFigure 2, longitudinally directed slot Threaded through the wall of thetube 21 is a pin 34 having a smooth inner end slidably in said slot forholding the sleeve against rotation and threaded upon the outer end ofsaid pin is a lock nut 35 securing the nin in position. At its inner endthe boring bar 23 carries a cutter head 36 upon which is mounted aplurality of radial cutters 37 but since the specific construction ofthe cutter head as well as the cutters does not concern the presentinvention these parts will not be described in detail.

Formed in the boring bar at one side thereof is a longitudinallyextending}; slot and surrounding); the bar within the gear case 16 is a,beveled gear 39 having; a hub 40 coactingr with the bottom vall of thecasino. Threaded through this hub are spaced cap bolts 41 having smoothinner ends slidahlv' engaging" in the slot 38 so that a drivingconnection between the beveled gear and boring bar is thus providedwhile. at the same time. the borinie' bar may shift longitudinallythrough. the gear. Formed on the cover plate 20 of the sear case at oneside of said plate is a gear housing 42 from which projects alateral'bearing 43 and c1:- tending through said bearing into thehousing is a drive shaft 4 1- so uared at its outer end. Fixed t0 theinner end of said shaft is a doublebeveled pinion having gear teeth 45and 46 respectively. the gear teeth 45 meshing); with the teeth of thebeveled gear 39 so tha when the drive shaftturned the borinsz' bar willbe rotated for revolving the cutter head. Closing the gear housing; 42is a cover plate 47 secured by suitable cap bolts and formed on saidplate is an upstanding hearing: 48 provided at its upper end withoverhanging; end plate on which is formed a bearing 50. Journaledthrough the. bearing 48 is a feed -r shaft 51 extending; into the gearhousing" 42 and fixed to the low-er end of said shaft within the housingis a beveled gear 52. the teeth of which mesh with the teeth 46 of thedouble beveled pinion upon the drive shaft 44.

' .c-ed on the bearing-tube 21 at its upper end is. as particularlyshown in Figure 2., a transversely disposed barrel at one end of whichis a bearing 54 and formed on the tube at the opposite end of saidbarrel is a boss 55 lying; 'fiush with the adjacent end of the barrel.hiounted upon said boss is a circular guard plate- 56 having aperipheral flange 57 and formed on said plate at one side thereof is abarrel 58 provided at its upper end as particularly shownin Figure 3,with a. bearing The plate is formed centrally with a bearing 60projecting into the barrel 53 and extending through said plate is a capscrew 61 threaded into the boss 55, rigidly connecting the plate withthe tube I 21. Journaled through the bearings 54 and 60 is a shaft 62upon which is a pinion 63 within the barrel 53 meshing with the rack 32of the sleeve 26. Freely mounted upon the shaft to lie within the flange5 1'- of the guard plate is a gear 64 through which is formed an annularseries of spaced openings 65. the screw 61 being removable through oneof said openings, and overlying thegear is a face plate (56 keyed to theshaft to turn therewith. Fixed upon the shaft to abut the hub of thisface plate is a squared head 67 and formed on the outer side of theplate near the periphery thereof is a boss 68. Slidahle through thisboss is, as particularly shown in Figure 4, a pin 69 in which are formedspaced annular grooves 70 and mounted upon the plate to engage in thesegrooves selectively is a spring pressed ball or detent 71. The pin isadapted to selectively engage in the openings 0f the gear (34 so thatsaid pin may be shiftedinwardly into any one of said openings forcoupling the face plate with the gear and consequentlv forming a drivingconnection between the shaft.

62 and the gear. On the other hand. by retracting the pin to free thegear. the shaft may be turned independently of said gear.

it being understood, of course. that the detent 71 will lock the pinwhen shifted inwardly or when retracted.

Journaled atone end in the bearing 59 of the barrel 58 and at itsopposite end in the bearing 50 of the plate 49 is. as particularly shownin Figure 3, a shaft 72 in the lower end portion of which is formed alongitudinally extending slot 73 and freely mounted on the shaft to restagainst the plate 49 is a gear 74 in which is formed .a slot 75. Fixedupon the shaft 51 to mesh with this gear'is .a pinion 76 above which isarranged a second pinion 7'1 and loosely mounted upon the shaft 72 torest against the gear 74 is a gear 78 meshing with the latter pinion.The gear 78 is formed in its lower side with an annular recess 79 andentering said recess through the hub of the gear is a slot 80. Fixed'tothe shaft 72 to coaet with the gear 78 is a collar 81 holding the shaftagainst down ward movement while upon the lower end of said shaft isarranged a collar 82 limiting the shaft against upward movement andfitting over the plate 49 to house the pinions 76 and 77 as well as thegears 74 and 78 is a housing cap 83 provided in its top wall with anopening snugly receiving the hub of the gear 7 8 thferethrough. Slidableupon the shaft 1 2 is a sleeve 84 and connected at one end to saidsleeve is a key 85 slidable in the slot 73 of the shaft. At its upperend, this key is provided with a lug 86 extending through the wall ofthe sleeve while at its lower end the key is provided with a some whatlonger lug 87 adapted to engage in the 7 and mounted on the shaft 72 toengage in said notches selectively is a spring pressed ball or detent89. Keyed upon the upper end portion of the shaft 72 within the barrel58 is a worm 9O meshing with the gear 64 and fitting in the lower end ofthe barrel is a bearing ring 91 surrounding the shaft and held inposition by a binding screw'92 extending through the wall of the barrel.

I further provide, as particularly shown in Figure 8, an operating crank93 for the machine. This crank is formed of mating inner and outersections, one provided with a longitudinally directed medial channel 94and the other provided with a longitudinally extending rib 95 slidablyengaging in said channel. Formed in the meeting ends of the sections arespaced bolt openings and selectively engageable through said openings isa 'bolt 96, this construction providing an ar rangement whereby theeffective length of the crank may be readily adjusted. The inner sectionof the crank is formed with a head 97 adapted to fit the squared outerend of the shaft 44 as well as the squaredhead 67 of the shaft 62 whilethe outer section of said crank is provided with a handle 98.

As will now be readily understood in view of the preceding description,when the pin 69 is shifted inwardly to coact with the gear 64, rotationof the shaft 7 2 will serve to turn the worm 90'and rotate the gear 64for turning the shaft 62. Rotation of this latter shaft will, of course,"cause the pinion 63 to coact with the rack 32 of the sleeve 26 of theboring bar for feeding the bar longitudinally. Furthermore, as will alsobe understood in view of the preceding descrip tion, when the shaft 44is rotated, the shaft 51 will be coincidently revolved so that in orderto effectfeeding of the boring bar coincident with the rotation thereof,it remains to couple the shaft 51 with the shaft 72. V In thisconnection particular attention is directed to Figure 3 of the drawings.In the position of the key 85 illustrated, it will be noted that the lug87 of said key is disposed within the recess 79 of the gear 78, thisbeing the neutral middle position of the key, so

that when said gear is turned by the pinion 77 uponthe-shaft 51, thegear will merely revolve upon the shaft 72. However, by shifting theslide 84 upwardly, the key may be elevated to'ride the lug 87 thereofinto the slot of said gear, the detent 89 then engaging in the lowermostof the notches 88 in the key for holding the key elevated. In

- this position of the key, said key will then form a driving connectionbetween the gear 7 7 a d a t 2 S9 t t when thecrank 9 i most of thenotches 88 of the key. In this lowered position of the key, thegear 74will then be coupled with the shaft 72 so that this shaft will be drivenfrom' the shaft 51 and attention is now directed to the fact that thegear 74 is somewhat smaller than the gear 78 while the gear 76 issomewhat larger than the gear 7 7 L The relative size of these gears issuch that when the key is shifted down wardly to coact with the gear 74,the shaft 7 2 will be turned at a somewhat greater speed than when'thekey is shifted upwardly to coact withth'egear 78. The rate of feed ofthe boring bar maythus be varied for a constant rate of rotation of saidbar, the elevated position of the key providing a slow feed and thelowered position of the key providing a faster feed. I As will thus beseen, when the shaft 44 is rotated, the boring bar. will be advanced foradvancing the cutter head 36 into the cylinder. However, since it isseldom possible to complete the reboring of a cylinder at one operationwithout examining the cylinder at varlous intermediatestages of thework, I have provided means whereby the boring bar with its cutter headmay be backed out of the cylinder. To effect this result the pin 69 isretracted to free the gear 64. The crank 93 is then applied to thesquared head 67 upon the shaft 62 when the shaft is coun- V tion,particular attention is directed to the fact that as the boring bar iswithdrawn. said bar will not be revolved so that the cutter head willalso not be revolved to'cause possible scoring of the cylinder wall; Aswill be perceived, the cutter head may be withdrawn from the cylinderquickly and easily and after the cutter head has been so withdrawn, thegear case 16 may be detached from the base 10 when the progress of theworkmay be inspected. Since removal of the gear-case from the base willnot molest the centering of the base with respect to the cylinder, thegear case may simply be replaced upon the base and the work continuedwithout the necessity for again iau 1. In a cylinder reboring machine, agear case having a bearing tube upstanding there from, a boring barjournalcd in said tube extending through the gear case, means housed bythe gear case coacting with the bar for rotating said b: a sleeve uponthe bar slidably fitting in said tube and provided with a rack, meansupon the tube coacting with said sleeve holding the sleeve againstrotation, and feed mechanism driven by said first mentioned meansincluding a pinion. coacting with said rack for advancing the bar.

2. In a cylinder reboring machine, a gear case, a rotatable boring barextending therethrough, means housed by the case for rotating said bar,a bearing upstanding from the gear case and provided with an endplate, ashaft journaled in said bearing driven by said means, a second shafthaving driving connection with the boring bar for feeding the bar andjournaled' at one end upon said plate, coacting gears associated withsaid shafts, and means for coupling and uncoupling certain of said gearsfor varying the rate of feed of the bar for a constant rate of rotationthereof.

3. In a cylinder 'reboring machine, a gear case, a rotatable boring barextending therethrough, means housed by the gear case for rotating saidbar, a. bearing upstanding from the gear case and provided with an endplate, a shaft journaled in said bearing driven by said means, a secondshaft having driving connection with the boring bar for feeding the barand journaled at one end upon said plate, coacting gear associated withsaidshafts, means for coupling and uncoupling certain of said gears forvarying the rate of feed of the bar for a constant rate of rotationthereof, and a housing mating withsaid plate enclosing the gears.

4. In a cylinder reboring machine, a gear case, a rotatable boring barextending there through, means including a drive gear housed by the gearcase for rotating said bar, the gear case being provided with anupstanding gear housing, a cover plate closing said housing and providedwith an upstanding bearing, a shaft journaled through said bearing. agear on said shaft within the housing meshing with said first mentionedgear, a second shaft l'iaving driving connection with the boring bar forfeedingthe bar, and coacting gears associated with said shafts normallycoupling the shafts.

5. Ina cylinder reboring machine, a gear case, a rotatable boring barextending there through, means including a dri e gear housed by the gearcase for rotating said bar, the gear case being provided with anupstanding gear housing a cover plate clos ing said housing andproviding with an upstanding bearing formed at its upper end with an endplate, a shaft journaled through said bearing, a gear on said shaft oneend upon said plate and having driving connection with the boring barfor feeding said bar, and reacting gears associated with said shaftsnormally coupling the shafts.

6. In a cylinder reboring machine, a gear case, a bearing tubeupstanding therefrom, a rotatable boring bar journaled in said tubeextending through the gear case, means for rotating said bar housed bythe gear case, a bearing mounted near the upper end of said tube andprovided with a barrel, a shaft journaled through said bearing andhaving driving connection with the bar for feeding the bar, a secondshaft journaled at one end upon said barrel and having drivingconnection with said first mentioned means, and a worm upon the lattershaft housed in said barrel and having driving connection with saidfirst mentioned shaft.

7. In a cylinder rebo ring machine, gea

r ase having an upstanding bearing tube, a rotatable boring barextending through the gear case and accommodated in said tube, means forrotating said bar housed by the gear case, a guard plate secured to thetube and provided with a bearing, a shaft jour naled through saidbearing and having driving" connection with said boring bar for feedingthe bar, a gear loose on said shaft partially housed by the plate, anelement fixed to the shaft and provided with means detachably engageablewith said gear coupling the gear and shaft to turn .-in unison, theplat-e being provided witha barrel, a second shaft journaled at one endupon the barrel, a worm upon the latter shaft meshing with said gear,and a driving connection between the latter shaft and said firstmentioned means.

8. In a cylinder reboring machine, a rotatable boring bar, a rack forreciprocating the bar, a shaft parallel to the bar, apair of shaftsgeared respectively to the boring bar, and to the rack both of saidshafts being also geared to the firstnamed shaft and projecting in thesame direction from the machine, and a single detachable handle adaptedto be placed on either shaft for driving it manually, substantially asset forth. v

9. In a cylinderreboring machine, a gear case having a bearingtubeupstanding therefrom, a boring bar journal'ed in said tube extendingthrough the gear case, means housed by the gear case coacting \vith'thebar for rotating said bar, a'sleeve uponthe bar slidably fitting in saidtube, andfeed mechanism driven by said rotating means for the boring barincluding a shaftextending crosswise of the boring bangearing connect-ing the shaftrespectively to eaidsleeve and to said rotating meansfor the boring bar said shaft being formed to receive a handle forindependent manual operation, and a clutch on the shaft fordisconnecting said shaft from the rotating means for the boring bar,substantially as set forth.

10. In a cylinder reboring machine, a gear case having a bearing tuberupstanding therefrom, a boring bar journaled in said tube extendingthrough the gear case, means housed by the gear case coacting with thebar for rotating said bar, a sleeve upon the bar slidably fitting insaid tube, and feed mechanism driven by said rotating means for theboring bar including a shaft extending crosswise of the boring bar saidshaft connected to said sleeve, a worm-gear loose on the shaft, a Wormmeshing with the worm-gear said worm being driven from the gearing forrotating the boring bar, a face plate fixed to the shaft, and a pin onthe face plate adapted to engage in any one of a series of holes in theworm-wheel, substantially as set forth.

11. In cylinder reboring machine, a boring bar, a gear case including anupright bearing tube for the boring bar, a' feed shaft parallel to theboring bar, common means for driving the boring bar and the feed shaft,a worm gear driven by the feed shaft,

a horizontal shaft loosely supporting said worm gear, swivellingconnections between the horizontal shaft and the boring bar constructedand arranged to raise and lower the boring bar, a face plate fixed tothe horizontal shaft, and a clutch element adapted to connect the faceplate to the worm gear, sub stantially as set forth. I

12. In a cylinder reboring machine, a vertical boring bar, a gear casehaving a bearing for said bar, a cap for the open upper end of the gearcase, adriving shaft for the bar 'journaled in said cap, a tube risingfrom the cap said bar being journaled in the tube, a lateral extensionon said case open at the top, a cover plate closing said opening, an endplate above the cover plate and integral therewith, a housing on the endplate, change speed gearing in the housing,

a vertical shaft journaled in said plate and extending into said housingfor driving said gearing said vertical shaft being geared to saiddriving shaft, a vertical shaft driven by said change speed gearing saidshaft being journaled at its foot in said end plate, and feeding meansfor the boring bar driven by said last-named shaft, substantially as setforth.

13. In a cylinder reboring machine, a boring bar, a beveled gearencircling the bar and secured thereto, feeding means including a shaftparallel to the boring bar, a beveled gear on the shaft, a driving shafthaving its axis in the same plane with those of said bar and saidfirst-named shaft, and a driving pinion having oppositely beveled setsof teeth engaging those of said gear and pinion, substantially as setforth.

In" testimony whereof I affix my signature.

FREDERICK T. FLINCHBAUGH. [L. S.]

